Trigger Definer Already Same But User Still Denied

currently I already have user like this 'app_user'@'10.148.0.0/255.255.240.0' and I have the trigger with definer like this CREATE DEFINER=app_user@10.148.0.0/255.255.240.0 TRIGGER usertable_delete_audit but when apps insert data i got this error trigger command denied to user 'app_user'@'10.148.0.0/255.255.240.0' for table user table. i already make sure about the grants this user already full grant. GRANT SELECT, INSERT, UPDATE, DELETE, CREATE, DROP, REFERENCES, INDEX, ALTER, CREATE TEMPORARY TABLES, LOCK TABLES, EXECUTE, CREATE VIEW, SHOW VIEW, CREATE ROUTINE, ALTER ROUTINE, EVENT, TRIGGER ON this impact from user with specific host ? i mean because the user have grant like this 10.148.0.0/255.255.240.0. And the trigger only can give the access from specific ip from server apps ? my server apps ip 10.148.0.57 i using mariadb version 10.4